Uniformize props name format

...s/environments/components/environment_external_url.js.es6

...vascripts/environments/components/environment_item.js.es6

...ripts/environments/components/environment_rollback.js.es6

...vascripts/environments/components/environment_stop.js.es6

app/assets/javascripts/vue_common_component/commit.js.es6

...scripts/environments/environment_external_url_spec.js.es6

...javascripts/environments/environment_rollback_spec.js.es6

spec/javascripts/environments/environment_stop_spec.js.es6